TP-Link TL-SG108E TL-SG108E V1 User Guide Easy Smart Configuration Utility 191 - Page 30

IEEE 802.1Q Frame, Port Based VLAN

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Easy Smart Configuration Utility User Guide （3） Network configuration workload for the host is reduced. VLAN can be used to group specific hosts. When the physical position of a host changes within the range of the VLAN, you do not need to change its network configuration. There are 3 types of VLAN modes supported in the switch: 1. MTU VLAN MTU VLAN (Multi-Tenant Unit VLAN) defines an uplink port which will build up several VLANs with each of the other ports. Each VLAN contains two ports, the uplink port and one of the other ports in the switch, so the uplink port can communicate with any other port but other ports cannot communicate with each other. 2. Port Based VLAN VLANs are divided based on ports. By default, the Port Based VLAN is enabled. 3. 802.1Q VLAN The IEEE 802.1Q protocol defines a new format of the frame; it adds a Tag header in the original Ethernet frame, as follows: Figure 6-2 IEEE 802.1Q Frame VLAN tags in the packets are necessary for the switch to identify packets of different VLANs. The switch works at the data link layer in OSI model and it can identify the data link layer encapsulation of the packet only, so you can add the VLAN tag field into the data link layer encapsulation for identification. IEEE 802.1Q Tag VLAN is divided by VLAN ID (VID). On receiving a frame, the switch checks the VID in the Tag header of the frame to decide which VLAN it belongs to. If the receiving frame doesn't contain the Tag header, the switch will assign a Tag to the frame, using the PVID of the port as its VID. In this User Guide, the tagged packet refers to the packet with VLAN tag whereas the untagged packet refers to the packet without VLAN tag. 27

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Easy Smart Configuration Utility
User Guide
（
3
）
Network configuration workload for the host is reduced. VLAN can be used to group
specific hosts. When the physical position of a host changes within the range of the VLAN,
you do not need to change its network configuration.
There are 3 types of VLAN modes supported in the switch:
1. MTU VLAN
MTU VLAN (Multi-Tenant Unit VLAN) defines an uplink port which will build up several VLANs
with each of the other ports. Each VLAN contains two ports, the uplink port and one of the other
ports in the switch, so the uplink port can communicate with any other port but other ports cannot
communicate with each other.
2. Port Based VLAN
VLANs are divided based on ports. By default, the Port Based VLAN is enabled.
3. 802.1Q VLAN
The IEEE 802.1Q protocol defines a new format of the frame; it adds a Tag header in the original
Ethernet frame, as follows:
Figure 6-2 IEEE 802.1Q Frame
VLAN tags in the packets are necessary for the switch to identify packets of different VLANs. The
switch works at the data link layer in OSI model and it can identify the data link layer
encapsulation of the packet only, so you can add the VLAN tag field into the data link layer
encapsulation for identification.
IEEE 802.1Q Tag VLAN is divided by VLAN ID (VID). On receiving a frame, the switch checks the
VID in the Tag header of the frame to decide which VLAN it belongs to. If the receiving frame
doesn’t contain the Tag header, the switch will assign a Tag to the frame, using the PVID of the
port as its VID.
In this User Guide, the tagged packet refers to the packet with VLAN tag whereas the untagged
packet refers to the packet without VLAN tag.
27